End cap assembly, energy storage device, and electric appliance

Abstract

The application discloses an end cover assembly, an energy storage device and an electric equipment. The end cover assembly comprises an end cover plate, a pole, an adapter sheet and an insulating piece. The end cover plate comprises a first surface and a second surface arranged away from the first surface along the thickness direction of the end cover plate, and the end cover plate further has a mounting hole penetrating through the first surface and the second surface. The insulating piece comprises a main plate attached to the second surface, and the main plate is provided with a via hole corresponding to the position of the mounting hole. The adapter sheet is attached to the side surface of the main plate away from the end cover plate and covers the via hole. The pole comprises a column and a flange, the column is arranged in the mounting hole and the via hole, the column comprises a first end and a second end arranged along the thickness direction of the end cover plate, the first end extends out of the first surface, and the flange is arranged around the outer circumferential surface of the first end. The second end is connected with the adapter sheet, and the main plate and the end cover plate are clamped between the flange and the adapter sheet.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more specifically, to an end cap assembly, an energy storage device including the end cap assembly, and an electrical device including the energy storage device. Background Technology

[0002] A rechargeable battery, also known as a secondary battery or storage battery, is a battery that can be recharged after being discharged, allowing the active materials to be reactivated and reused. The recyclable nature of rechargeable batteries has made them an increasingly important power source for electrical equipment.

[0003] In related technologies, batteries typically consist of an end cap assembly, an electrode assembly, and a housing. The actual manufacturing process involves fabricating the end cap assembly, electrode assembly, and housing separately. Then, metal adapters are used to weld the terminals of the end cap assembly and the tabs of the electrode assembly together. The electrode assembly is then placed inside the housing, and the end cap assembly is used to close the opening of the housing and welded shut. Afterward, electrolyte is added through the injection port on the top cover of the battery, and the injection port is then welded shut.

[0004] However, the structural design of the end cap assembly in the relevant technology still needs further improvement, and it cannot meet people's higher requirements for battery energy density and reliability. Summary of the Invention

[0005] This application provides an end cap assembly, an energy storage device, and an electrical device to improve the problems of low energy density and reliability of the end cap assembly.

[0006] The end cap assembly of this application embodiment includes:

[0007] An end cap plate includes a first surface and a second surface disposed opposite to the first surface along the thickness direction of the end cap plate, and the end cap plate further has a mounting hole penetrating the first surface and the second surface;

[0008] An insulating component includes a main plate, the main plate being attached to the second surface of the end cover plate, and the main plate having through holes corresponding to the positions of mounting holes;

[0009] An adapter piece is attached to the surface of the main body plate opposite to the end cover plate and covers the through hole; and

[0010] The pole includes a column and a flange; the column passes through the mounting hole and the through hole, and has a first end and a second end arranged along the thickness direction of the end cover plate, the first end extends out of the first surface, the flange surrounds and connects to the outer peripheral surface of the first end, the second end is connected to the adapter piece, and the main plate and the end cover plate are sandwiched between the flange and the adapter piece.

[0011] In this embodiment, the electrode post includes a column and a flange. The flange surrounds and connects to the outer peripheral surface of the first end of the electrode post, and the second end is connected to an adapter plate. The main body plate and the end cover plate are sandwiched between the flange and the adapter plate. Thus, the end cover assembly in this embodiment eliminates the need for a flange on the electrode post to achieve the assembly and connection of the electrode post, end cover plate, and insulating components, thereby reducing the thickness of the end cover assembly and consequently reducing the space occupied by the end cover assembly in the entire energy storage device. This increases the energy density of the energy storage device without changing its overall volume.

[0012] According to some embodiments of this application, the outer surface of the end cap plate and the outer surface of the pole post both have nanopores; the insulating component is an injection molded component.

[0013] In this embodiment, since the outer surfaces of the end cap and the pole have nanopores, after the nano-injection molding process is completed, anchor bolt structures are formed between the insulating component and the end cap, as well as between the insulating component and the pole. The anchor bolt structures can improve the sealing performance and connection strength between the insulating component and the end cap, as well as between the insulating component and the pole.

[0014] According to some embodiments of this application, the column includes a first column near the adapter piece and a second column away from the adapter piece, and the flange is connected to the outer peripheral surface of the second column.

[0015] The insulating element surrounds and wraps around the entire outer peripheral surface of the first post, and the second post is exposed on the outer peripheral surface of the flange and the outer peripheral surface of the flange;

[0016] The first pillar is made of a first material, and the second pillar and the flange are made of a second material, wherein the etching rate of the first material is less than the etching rate of the second material.

[0017] In the embodiments of this application, the first post is made of a first material, and the second post and flange are made of a second material. The etching rate of the first material is less than that of the second material, which increases the surface area of ​​the insulating component in contact with the second material, thereby improving the sealing and connection between the insulating component and the post.

[0018] According to some embodiments of this application, the first material is copper and the second material is aluminum.

[0019] According to some embodiments of this application, the insulating element further includes:

[0020] An insulating convex ring is integrally connected to the side surface of the main body plate facing the end cover plate and surrounds the through hole; the insulating convex ring passes through the mounting hole and surrounds the outer peripheral surface of the column and the outer peripheral surface of the flange.

[0021] In this embodiment, the insulating component includes an integrally connected main body plate and an insulating protruding ring, further simplifying the number of components in the end cap assembly and thus reducing installation difficulty. Furthermore, the flange and the adapter abut against the insulating component axially, thereby fixing and limiting the insulating component and the electrode post in the axial and radial directions of the electrode post, allowing the electrode post to be installed in the mounting hole without riveting.

[0022] According to some embodiments of this application, the end cover plate further has a second recessed groove formed by the second surface in the direction of the first surface, and the end cover plate further has a vent hole penetrating the bottom surface of the second recessed groove and the first surface;

[0023] The end cap assembly also includes an explosion-proof valve, which is housed in the second sinking groove and closes the vent hole;

[0024] The main body plate has a first perforation corresponding to the position of the vent hole. The explosion-proof valve includes a rupture part and a fixing part. The rupture part is exposed through the first perforation on the side surface of the main body plate facing away from the end cover plate. The fixing part surrounds the rupture part and is sandwiched between the bottom surface of the second sinking trough and the main body plate.

[0025] In this embodiment, the explosion-proof valve can also be assembled using nano-injection molding. The electrode post, end cap plate, and explosion-proof valve are sequentially placed in the injection mold. The explosion-proof valve is housed within the second recessed groove of the end cap plate, with the fixing part of the explosion-proof valve contacting the bottom surface of the second recessed groove. Subsequently, an insulating component is formed through injection molding. The main body plate of the insulating component is attached to the fixing part of the explosion-proof valve, thus confining the explosion-proof valve within the second recessed groove. Therefore, the assembly of the electrode post, end cap plate, and explosion-proof valve can be completed in a single injection molding process, reducing assembly difficulty, saving assembly costs, and improving assembly efficiency.

[0026] According to some embodiments of this application, the number of the pole post, the adapter piece, and the insulating member are all two;

[0027] The end cover plate is rectangular and has a mounting hole at each end along its length. The two mounting holes are respectively located in the two mounting holes.

[0028] The two main plates of the two insulating elements are laid flat on the second surface and extend from both ends of the end cap plate in a direction close to each other along the length of the end cap plate.

[0029] In this embodiment, the two main plates of the two insulating members are laid flat on the second surface of the end cover plate and extend from both ends of the end cover plate along a direction close to each other. Thus, the two insulating members, formed by nano-injection molding, can be attached to the second surface of the end cover plate, thereby improving the strength of the end cover plate. By attaching the two insulating members to the second surface of the end cover plate, the thickness of the end cover plate can be reduced, thereby reducing the space ratio of the top cover assembly.

[0030] According to some embodiments of this application, the end cap further includes a boss protruding from the second surface, and the end cap also has an injection hole penetrating the first surface and the side surface of the boss facing away from the second surface.

[0031] The main plate has a second through hole through which the boss passes.

[0032] In this embodiment, the end cover plate further includes a boss protruding from the second surface, and the insulating member has a second through hole through which the boss passes. The boss and the insulating member can jointly improve the structural strength around the injection hole of the end cover plate, and prevent the part around the injection hole from deforming and expanding during the injection process, thereby pulling the explosion-proof valve and affecting the stability of the explosion-proof valve bursting.

[0033] According to some embodiments of this application, the end cover plate further has a first recessed groove formed in the direction from the first surface to the second surface, and the mounting hole penetrates the bottom surface of the first recessed groove;

[0034] In the thickness direction, a portion of the flange is accommodated within the first recessed groove, and a portion of the flange extends out of the first surface.

[0035] In this embodiment of the application, the end cover plate is recessed from the first surface to the second surface to form a first recessed groove. By setting the first recessed groove, part of the flange can be accommodated in the first recessed groove, thereby reducing the size of the part of the pole post protruding from the first surface of the end cover plate, making the end cover assembly thinner, which is beneficial to reducing the space ratio of the end cover assembly in the entire energy storage device.

[0036] According to some embodiments of this application, a first chamfer is provided at the connection between the bottom surface of the first groove and the inner wall surface of the mounting hole, and the first chamfer is between C0.1 and C0.5.

[0037] In this embodiment, by providing a first chamfer at the connection between the bottom surface of the first groove and the inner wall surface of the mounting hole, stamping burrs generated during the stamping manufacturing of the end cover plate can be eliminated, reducing the risk of short circuits. Simultaneously, during nano-injection molding, the 45-degree chamfer helps guide the flow of molten plastic and avoids air entrapment.

[0038] According to some embodiments of this application, the first sinking trough also has a trough side surface, which is connected to the bottom surface of the first trough and extends obliquely from the bottom surface of the first trough in a direction away from the axis of the column to the first surface.

[0039] In this embodiment, the end cap can be formed by stamping. By designing the side surface of the first sinking groove as an inclined surface, metal chips or burrs can be avoided from being generated by the punch scraping against the side surface of the groove. Simultaneously, during nano-injection molding, the molten plastic flows from the second surface of the end cap through the mounting hole to the first surface. Since the side surface of the groove in this embodiment extends inclinedly from the bottom surface of the first groove towards the direction away from the axis of the column to the first surface, it is beneficial to improve the fluidity of the molten plastic during injection molding and further avoid air entrapment.

[0040] According to some embodiments of this application, a second chamfer is provided at the connection between the inner wall surface of the mounting hole and the second surface, and the second chamfer is between C0.1 and C0.5.

[0041] In this embodiment, a second chamfer is provided at the connection between the inner wall of the mounting hole and the second surface, which can eliminate stamping burrs generated during the stamping manufacturing of the end cover plate and reduce the risk of short circuits. Simultaneously, during nano-injection molding, the 45-degree chamfer helps guide the flow of molten plastic and avoids air entrapment.

[0042] The energy storage device according to embodiments of this application includes a housing, an electrode assembly, and the end cap assembly described in any of the above embodiments. The housing includes a receiving cavity with an opening; the electrode assembly is housed within the receiving cavity; and the end cap assembly closes the opening of the receiving cavity.

[0043] The electrical equipment in this application embodiment includes the energy storage device described above, and the energy storage device supplies power to the electrical equipment. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of a residential energy storage system according to an exemplary embodiment.

[0045] Figure 2 This is an exploded schematic diagram of an energy storage device according to an exemplary embodiment.

[0046] Figure 3 This is an exploded view of an end cap assembly according to an exemplary embodiment.

[0047] Figure 4 This is an exploded schematic diagram of an end cap assembly shown from another perspective according to an exemplary embodiment.

[0048] Figure 5 yes Figure 2Sectional view of the middle end cap assembly along AA.

[0049] Figure 6 yes Figure 5 A magnified view of the area at point X1.

[0050] Figure 7 yes Figure 5 A magnified view of the area at X2 in the middle.

[0051] Figure 8 yes Figure 5 A magnified view of the area at X3.

[0052] Figure 9 This is a schematic diagram of the structure of an end cap assembly according to an exemplary embodiment.

[0053] Figure 10 This is an exploded view of two insulating elements and an end cap plate according to an exemplary embodiment.

[0054] Figure 11 This is a cross-sectional view of an end cap assembly shown according to another exemplary embodiment.

[0055] Figure 12 yes Figure 11 A magnified view of the area at X4 in the middle.

[0056] Figure 13 This is a cross-sectional view of an end cap assembly shown according to yet another exemplary embodiment.

[0057] Figure 14 yes Figure 13 A magnified view of the area at point X5.

[0058] The reference numerals in the attached figures are explained as follows:

[0059] 1. Energy storage device;

[0060] 2. Power conversion device;

[0061] 3. User load;

[0062] 100. Shell; 101. Opening; 110. Receiving cavity;

[0063] 200. Electrode assembly;

[0064] 300. End cap assembly;

[0065] 310. End cover plate; 310a. First surface; 310b. Second surface; 311. Mounting hole;

[0066] 311-1, First mounting hole; 311-2, Second mounting hole; 311a, Inner wall surface; 312, Hole edge; 313, First sinking groove; 313a, Bottom surface of the first groove; 313b, Side surface of the groove; 314, Second sinking groove; 314a, Bottom surface of the second groove; 315, Vent hole; 316, Boss; 317, Injection hole;

[0067] 320, pole post; 320-1, first pole post; 320-2, second pole post; 321, column body; 321a, first end face; 321b, second end face; 321c, first column; 321d, second column; 322, flange; 322a, third surface; 322b, fourth surface; 322c, outer edge surface; 322d, annular groove; 322e, bottom surface of the groove;

[0068] 330, Insulating component; 330-1, First insulating component; 330-2, Second insulating component; 331, Main body plate; 331a, Through hole; 331b, First through hole; 331c, Rectangular plate; 331d, Protrusion; 331e, Groove; 331f, Second through hole; 331g, First side edge; 331h, Second side edge; 332, Insulating protruding ring;

[0069] 340, Adapter piece; 340-1, First connector; 340-2, Second connector; 340a, Third side edge; 341, Through hole;

[0070] 350. Explosion-proof valve; 351. Rupture section; 352. Fixing section;

[0071] 410. First chamfer; 420. Second chamfer; 430. Third chamfer;

[0072] D. Thickness direction;

[0073] G. Gap. Detailed Implementation

[0074] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0075] Since the energy people need is highly time- and space-dependent, in order to make rational use of energy and improve energy efficiency, it is necessary to use a medium or device to store one form of energy in the same way or by converting it into another form of energy, and then release it in a specific form of energy based on future application needs.

[0076] Currently, green energy mainly includes solar energy, wind energy, and hydropower. However, solar and wind energy generally suffer from strong intermittency and large fluctuations, which can cause voltage instability in the green power grid (insufficient electricity during peak demand and excessive electricity during off-peak demand). Unstable voltage can damage the power grid, and therefore may lead to the problem of "curtailment of wind and solar power" due to insufficient electricity demand or insufficient grid capacity.

[0077] To solve the problem of insufficient electricity demand or inadequate grid capacity, we must rely on energy storage devices. These devices convert electrical energy into other forms of energy through physical or chemical means and store it. When needed, the stored energy is converted back into electrical energy and released. Simply put, an energy storage device is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing it when required.

[0078] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0079] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, enabling load matching of electrical energy in time and space, enhancing the absorption capacity of renewable energy, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak regulation and frequency regulation.

[0080] (2) Small and medium-sized energy storage cabinets used in commercial and industrial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in residential energy storage scenarios primarily operate under the "peak shaving and valley filling" mode. Because there are significant price differences in electricity consumption during peak and off-peak periods, users with energy storage devices typically charge the cabinets / boxes during off-peak hours to reduce costs; during peak hours, they release the stored electricity for use, thus saving on electricity bills. Furthermore, in remote areas and regions prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices effectively provides backup power for users and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0081] This explanation will take the residential energy storage scenario in user-side energy storage as an example. Figure 1A residential energy storage system is illustrated, comprising an energy storage device 1, a power conversion device 2 (such as a photovoltaic panel), and user loads 3 (such as streetlights, household appliances, etc.). The energy storage device 1 is a small energy storage box that can be wall-mounted to an outdoor wall. Specifically, the power conversion device 2 can convert solar energy into electrical energy during periods of low electricity prices and store it through the energy storage device 1, then supply it to the user loads 3 during periods of high electricity prices, or supply it to the user loads 3 during power outages / power interruptions.

[0082] In conjunction with the aforementioned energy storage methods using physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 1 includes at least one set of chemical batteries. The chemical elements within these batteries serve as the energy storage medium, and the charging and discharging process is achieved through the chemical reactions or changes in the storage medium. Simply put, electrical energy generated from solar or wind power is stored in at least one set of chemical batteries through the chemical reactions or changes in the storage medium. When external power consumption reaches its peak, the stored energy is released through the chemical reactions or changes in the storage medium for use, or transferred to areas with power shortages.

[0083] This application provides an energy storage device 1, which can be, but is not limited to, a single battery (secondary battery), a battery module, a battery pack, or a battery system composed of single batteries. The single battery can be a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and can be cylindrical, flat, cuboid, etc., and this application does not limit the form. The following explanation uses a square single battery as an example to illustrate the energy storage device 1.

[0084] like Figure 2 As shown, the energy storage device 1 of this application embodiment includes a housing 100, an electrode assembly 200, and an end cap assembly 300. The housing 100 includes a receiving cavity 110 with an opening 101, the electrode assembly 200 is housed in the receiving cavity 110, and the end cap assembly 300 is connected to the housing 100 and closes the opening 101 of the receiving cavity 110.

[0085] It is understood that the terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0086] The housing 100 can be a cylindrical structure with an opening 101 at one end. In this case, the energy storage device 1 includes an end cap assembly 300, which seals the opening 101. Alternatively, the housing 100 can also be a cylindrical structure with openings 101 at both ends. In this case, the energy storage device 1 can include an end cap assembly 300 and a cover plate, or the energy storage device 1 can include two end cap assemblies. Thus, one end cap assembly 300 and a cover plate, or two end cap assemblies 300, can respectively seal the two openings 101 of the housing 100.

[0087] The electrode assembly 200 includes a positive electrode, a negative electrode, and a separator. The single-cell battery primarily operates by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the coated positive current collector, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated negative current collector protrudes beyond the coated negative current collector, serving as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP or PE, etc. Furthermore, the electrode assembly 200 can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0088] The positive and negative electrodes can be located at the same end of the electrode assembly 200 (e.g., a square single-cell battery) or at different ends of the electrode assembly 200 (e.g., a cylindrical single-cell battery). When the positive and negative electrodes are located at the same end of the electrode assembly 200, the end cap assembly 300 can be provided with a positive terminal and a negative terminal, with the positive terminal connected to the positive electrode and the negative terminal connected to the negative electrode, so that the electrical energy output of the electrode assembly 200 can be realized through the positive and negative terminals. When the positive and negative electrodes are located at opposite ends of the electrode assembly 200, one of the positive and negative electrodes is connected to a terminal provided on the end cap assembly 300, and the other of the positive and negative electrodes is connected to the bottom of the housing 100 or a terminal provided on another end cap assembly 300. The terminal connected to the positive electrode is the positive terminal, and the terminal connected to the negative electrode is the negative terminal.

[0089] like Figure 3 and Figure 4 As shown, the end cap assembly 300 includes an end cap plate 310, a pole post 320, an adapter piece 340, an insulating component 330, and an explosion-proof valve 350.

[0090] In one embodiment, the end cap 310 may be made of aluminum. Both the end cap 310 and the pole post 320 are stamped parts.

[0091] In this embodiment, when the energy storage device 1 is a square single-cell battery, the end cap assembly 300 includes two terminals 320, two adapter pieces 340, and two insulating members 330. For ease of explanation, the two terminals 320 are defined as the first terminal 320-1 and the second terminal 320-2, the two adapter pieces 340 are defined as the first connector 340-1 and the second connector 340-2, and the two insulating members 330 are defined as the first insulating member 330-1 and the second insulating member 330-2. The first connector 340-1 and the first insulating member 330-1 correspond to the first terminal 320-1, and the second connector 340-2 and the second insulating member 330-2 correspond to the second terminal 320-2. The first terminal 320-1 can serve as the negative terminal of the energy storage device 1, and the second terminal 320-2 can serve as the positive terminal of the energy storage device 1.

[0092] Of course, in other embodiments, when the energy storage device 1 is a cylindrical single cell battery, the end cap assembly 300 may include a terminal post 320, an adapter piece 340 and an insulator 330.

[0093] The end cap assembly 300, comprising two terminals 320, two adapter pieces 340, and two insulating parts 330, will be described in detail below. It should be noted that the negative and positive terminals are mounted on the end cap plate 310 in a similar structure; therefore, the following description will only use the mounting structure of one terminal 320 as an example.

[0094] like Figures 3 to 6 As shown, the end cover plate 310 includes a first surface 310a and a second surface 310b disposed opposite to the first surface 310a along the thickness direction D of the end cover plate 310. The end cover plate 310 also has a mounting hole 311 penetrating the first surface 310a and the second surface 310b. The insulating component 330 includes a main body plate 331, which is attached to the second surface 310b of the end cover plate 310. The main body plate 331 has a through hole 331a corresponding to the position of the mounting hole 311. The adapter piece 340 is attached to the side surface of the main body plate 331 away from the end cover plate 310 and covers the through hole 331a. The pole post 320 includes a column body 321 and a flange 322. The column body 321 passes through the mounting hole 311 and the through hole 331a and has a first end and a second end arranged along the thickness direction D of the end cover plate 310. The first end extends out of the first surface 310a, the flange 322 surrounds and connects to the outer peripheral surface of the first end, and the second end is connected to the adapter piece 340. The main body plate 331 and the end cover plate 310 are sandwiched between the flange 322 and the adapter piece 340.

[0095] In this embodiment, the pole post 320 includes a column 321 and a flange 322. The flange 322 surrounds and connects to the outer peripheral surface of the first end of the pole post 320, and the second end is connected to the adapter plate 340. The main body plate 331 and the end cover plate 310 are sandwiched between the flange 322 and the adapter plate 340. Thus, the end cover assembly in this embodiment does not require a flange on the pole post 320 to achieve the assembly and connection of the pole post 320, the end cover plate 310, and the insulating component 330, thereby reducing the thickness of the end cover assembly and thus reducing the space occupied by the end cover assembly in the entire energy storage device. Under the premise of maintaining the overall volume of the energy storage device, the energy density of the energy storage device is increased.

[0096] Furthermore, the end cover plate 310 has a hole edge portion 312 located at the edge of the mounting hole 311, and the hole edge portion 312 surrounds the mounting hole 311. The hole edge portion 312 and part of the insulating member 330 are sandwiched between the flange 322 and the adapter piece 340 along the thickness direction D of the end cover plate 310.

[0097] It should be noted that in related technologies, when multiple energy storage devices (such as prismatic single-cell batteries) are electrically connected, such as in series, parallel, or series-parallel connections, conductive components need to be welded onto the terminals of each energy storage device. During the welding process and subsequent use of the energy storage device, the terminals are typically subjected to forces along the thickness direction of the energy storage device. Under the influence of these forces, the terminals are prone to movement. If the terminals move inward into the energy storage device, on the one hand, the sealing performance of the end cap assembly will be affected, leading to electrolyte leakage; on the other hand, inward movement of the terminals will affect the welding quality between the terminals and the conductive components, resulting in a weak electrical connection and affecting the normal operation of the battery.

[0098] Based on this, this application provides an end cap assembly 300. An end cap plate 310 has a hole edge portion 312 located at the edge of the mounting hole 311. Along the thickness direction D of the end cap plate 310, the hole edge portion 312 and a portion of the insulating member 330 are sandwiched between a flange 322 and an adapter piece 340. Thus, the hole edge portion 312 and the portion of the insulating member 330 of the end cap plate 310 are firmly clamped by the flange 322 and the adapter piece 340. When the pole post 320 is subjected to a tensile force from the second surface 310b of the end cap plate 310 towards the first surface 310a, the hole edge portion 312 of the end cap plate 310 can act as a stop for the adapter piece 340, preventing the pole post 320 from moving. When the pole post 320 is subjected to a pushing force from the first surface 310a to the second surface 310b of the end cover plate 310, the hole edge portion 312 of the end cover plate 310 can act as a stop flange 322 to prevent the pole post 320 from moving. Therefore, the end cover assembly 300 of this embodiment, through the design of the hole edge portion 312 and part of the insulating member 330 sandwiched between the flange 322 and the adapter piece 340 along the thickness direction D of the end cover plate 310, makes the pole post 320 less prone to movement. On the one hand, it avoids the pole post 320 moving and pressing against the insulating member 330, affecting the sealing performance of the end cover assembly 300; on the other hand, it avoids welding defects caused by the movement of the pole post 320.

[0099] The outer surfaces of the end cap 310 and the electrode post 320 both have nanopores, and the insulating part 330 is an injection molded part. The nanopores can be formed by immersing the end cap 310 and the electrode post 320 in an acidic solvent to etch the nanopores.

[0100] In this embodiment of the application, the manufacturing process of the end cap assembly 300 can be as follows: the pole post 320 and the end cap plate 310 with nanopores formed are placed sequentially in the injection mold, and then the insulating part 340 is nano-injected.

[0101] Understandably, since the outer surfaces of the end cap 310 and the pole post 320 both have nanopores, after the nano-injection molding process is completed, anchor structures will be formed between the insulating component 330 and the end cap 310, as well as between the insulating component 330 and the pole post 320. The anchor structures can improve the sealing performance and connection strength between the insulating component 330 and the end cap 310, as well as between the insulating component 330 and the pole post 320.

[0102] It should be noted that nanopores refer to pores with diameters at the nanometer level.

[0103] like Figure 6As shown, the insulating component 330 also includes an insulating protrusion ring 332. The insulating protrusion ring 332 is integrally connected to the side surface of the main body plate 331 facing the end cover plate 310 and surrounds the through hole 331a; the insulating protrusion ring 332 passes through the mounting hole 311 and surrounds the outer peripheral surface of the column 321 and the outer peripheral surface of the flange 322.

[0104] In this embodiment, the insulating convex ring 332 surrounds the outer peripheral surface of the column 321 and the outer peripheral surface of the flange 322, isolating the pole post 320 from the end cover plate 310 and preventing short circuits caused by contact between the pole post 320 and the end cover plate 310. The main body plate 331 is attached to the second surface 310b, and the adapter piece 340 is disposed on the side surface of the main body plate 331 facing away from the end cover plate 310. The main body plate 331 isolates the end cover plate 310 from the adapter piece 340, preventing short circuits caused by contact between the adapter piece 340 and the end cover plate 310.

[0105] Furthermore, the insulating component 330 includes an integrally connected main body plate 331 and insulating protrusion ring 332, further simplifying the number of components in the end cap assembly and thus reducing installation difficulty. Additionally, the flange 322 and the adapter 340 abut against the insulating component 330 axially, thereby fixing and limiting the insulating component 330 and the pole post 320 in the axial and radial directions of the pole post, allowing the pole post 320 to be installed in the mounting hole 311 without riveting.

[0106] like Figure 6 As shown, the column 321 has a first end face 321a and a second end face 321b disposed opposite to each other along the thickness direction D. The first end face 321a extends beyond the first surface 310a, and the second end face 321b is connected to the side surface of the adapter piece 340 facing the end cover plate 310 by welding.

[0107] In this embodiment, the side surface of the adapter piece 340 facing the end cover plate 310 is attached to the second end face 321b of the column 321, and the adapter piece 340 and the column 321 can be connected by laser welding.

[0108] like Figure 6 As shown, the end cover plate 310 also has a first recessed groove 313 formed in the direction of the first surface 310a toward the second surface 310b, and the mounting hole 311 penetrates the first groove bottom surface 313a of the first recessed groove 313; the hole edge portion 312 is formed between the first groove bottom surface 313a and the second surface 310b of the end cover plate 310; in the thickness direction D, a portion of the flange 322 is accommodated in the first recessed groove 313, and a portion of the flange 322 extends out of the first surface 310a.

[0109] In this embodiment of the application, the end cover plate 310 is recessed in the direction from the first surface 310a to the second surface 310b to form a first recessed groove 313. By setting the first recessed groove 313, a portion of the flange 322 can be accommodated in the first recessed groove 313, thereby reducing the size of the portion of the pole post 320 protruding from the first surface 310a of the end cover plate 310, making the end cover assembly 300 thinner, which is beneficial to reducing the space ratio of the end cover assembly 300 in the entire energy storage device 1.

[0110] In one embodiment, the distance L1 between the first end face 321a of the column 321 and the side surface of the main body plate 331 facing away from the end cover plate 310 is 2.5mm to 5mm, for example, L1 is 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm.

[0111] like Figure 6 As shown, in one embodiment, the thickness t of the main body plate 331 is between 0.5 mm and 1.5 mm. For example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, and 1.5 mm.

[0112] In this embodiment, the thickness of the main body plate 331 is designed to be 0.5mm to 1.5mm. In this way, the main body plate 331 is attached to the second surface 310b of the end cover plate 310, which can improve the structural strength of the end cover plate 310 without increasing the overall thickness of the end cover assembly 300 too much.

[0113] like Figure 7 As shown, a first chamfer 410 is provided at the connection between the bottom surface 313a of the first groove and the inner wall surface 311a of the mounting hole 311. The first chamfer 410 is between C0.1 and C0.5. For example, the first chamfer 410 is C0.1, C0.2, C0.3, C0.4, or C0.5.

[0114] It should be noted that C0.1 means that the first chamfer 410 is a 45-degree chamfer, and the length of the right angle side of the chamfer is 0.1mm, that is, the first chamfer 410 is 0.1×45°. Similarly, C0.5 represents 0.5×45°.

[0115] In this embodiment, a first chamfer 410 is provided at the connection between the bottom surface 313a of the first groove and the inner wall surface 311a of the mounting hole 311. This eliminates stamping burrs generated during the stamping process of the end cover plate 310, reducing the risk of short circuits. Simultaneously, during nano-injection molding, the 45-degree chamfer helps guide the flow of molten plastic and prevents air entrapment.

[0116] like Figure 7As shown, the first sinking trough 313 also has a trough side 313b, which is connected to the first trough bottom surface 313a and extends obliquely from the first trough bottom surface 313a in a direction away from the axis of the column 321 to the first surface 310a.

[0117] Furthermore, the side surface 313b of the groove is a conical surface, and the cone angle of the conical surface is between 5 degrees and 60 degrees. For example, the cone angle is 5 degrees, 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, or 60 degrees.

[0118] In this embodiment, the end cap 310 can be formed by stamping. By designing the side surface 313b of the first sinking groove 313 as a conical surface with a cone angle between 5 and 60 degrees, metal chips or burrs can be avoided from being generated by the punch scraping against the side surface 313b. Simultaneously, during nano-injection molding, the molten plastic flows from the second surface 310b of the end cap 310 through the mounting hole 311 to the first surface 310a. Since the side surface 313b of the groove in this embodiment extends obliquely from the bottom surface 313a of the first groove towards the axis away from the column 321 to the first surface 310a, it is beneficial to improve the fluidity of the molten plastic during injection molding and further avoid air entrapment.

[0119] like Figure 7 As shown, a second chamfer 420 is provided at the connection between the inner wall surface 311a of the mounting hole 311 and the second surface 310b. The second chamfer 420 is between C0.1 and C0.5. For example, the second chamfer 420 is C0.1, C0.2, C0.3, C0.4, or C0.5.

[0120] In this embodiment, a second chamfer 420 is provided at the connection between the inner wall surface 311a of the mounting hole 311 and the second surface 310b, which can eliminate stamping burrs generated during the stamping process of the end cover plate 310 and reduce the risk of short circuit. At the same time, during nano-injection molding, the 45-degree chamfer helps guide the flow of molten plastic and avoids air entrapment.

[0121] like Figure 7 As shown, along the thickness direction D, the flange 322 has a third surface 322a facing the edge of the hole 312 and a fourth surface 322b disposed opposite to the third surface 322a; the fourth surface 322b is flush with the first end face 321a of the column 321.

[0122] In this embodiment, the fourth surface 322b of the flange 322 is flush with the first end face 321a of the pillar 321. Thus, when the electrode 320 is welded to a conductive component (not shown), both the fourth surface 322b of the flange 322 and the first end face 321a of the pillar 321 can be welded to the conductive component, increasing the contact area between the electrode 320 and the conductive component, thereby ensuring welding strength and preventing poor welding due to a small welding area between the electrode 320 and the conductive component. In other words, in this embodiment, the flange 322 of the electrode 320 can both cooperate with the stop of the hole edge 312 and be welded to the conductive component.

[0123] Furthermore, the flange 322 also has an outer edge surface 322c facing away from the column 321 and surrounding the column 321; the flange 322 also has an annular groove 322d formed by the fourth surface 322b recessed in the direction of the third surface 322a and the outer edge surface 322c recessed in the direction of the column 321, the annular groove 322d having a groove bottom surface 322e parallel to the fourth surface 322b, the groove bottom surface 322e being parallel to the fourth surface 322b, and the distance L2 between the two being 0.3mm to 1mm. For example, L2 is 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm.

[0124] In this embodiment, an annular groove 322d is formed at the junction of the fourth surface 322b and the outer edge surface 322c of the flange 322. During the nano-injection molding process, the pole post 320 is placed in the injection mold, and the positioning core in the injection mold can be inserted into the annular groove 322d to position the pole post 320 and prevent the pole post 320 from being misaligned relative to the end cover plate 310.

[0125] like Figure 7 As shown, the flange 322 also has an outer edge surface 322c facing away from the column 321 and surrounding the column 321; a third chamfer 430 is provided at the connection between the outer edge surface 322c and the third surface 322a, and the third chamfer 430 is between C0.1 and C0.5. For example, the third chamfer 430 is C0.1, C0.2, C0.3, C0.4, or C0.5.

[0126] In this embodiment of the application, by providing a third chamfer 430 at the connection between the outer edge surface 322c of the flange 322 and the third surface 322a, on the one hand, the stamping burrs generated during the stamping manufacturing of the pole post 320 can be eliminated, reducing the risk of short circuit; on the other hand, during nano-injection molding, the 45-degree chamfer helps to guide the flow of molten plastic and avoid air entrapment.

[0127] like Figure 8As shown, the end cover plate 310 also has a second recessed groove 314 formed by the second surface 310b recessed towards the first surface 310a. The end cover plate 310 also has a vent hole 315 penetrating the second groove bottom surface 314a and the first surface 310a of the second recessed groove 314. The explosion-proof valve 350 is housed in the second recessed groove 314 and closes the vent hole 315. The main body plate 331 has a first through hole 331b corresponding to the position of the vent hole 315. The explosion-proof valve 350 includes a rupture part 351 and a fixing part 352. The rupture part 351 is exposed on the side surface of the main body plate 331 facing away from the end cover plate 310 through the first through hole 331b. The fixing part 352 surrounds the rupture part 351 and is sandwiched between the second groove bottom surface 314a of the second recessed groove 314 and the main body plate 331.

[0128] It should be noted that when the gas generated inside the energy storage device 1 reaches the critical value of the explosion-proof point, the rupture part 351 of the explosion-proof valve 350 can be broken by the gas, so as to release the gas inside the casing 100 in time and prevent the energy storage device 1 from exploding.

[0129] In this embodiment, the explosion-proof valve 350 can also be assembled using nano-injection molding. Specifically, the pole post 320, end cap plate 310, and explosion-proof valve 350 are sequentially placed in an injection mold. The explosion-proof valve 350 is housed within the second recessed groove 314 of the end cap plate 310, and the fixing part 352 of the explosion-proof valve 350 contacts the bottom surface 314a of the second recessed groove 314. Subsequently, an insulating part 330 is formed through injection molding. The main body plate 331 of the insulating part 330 is attached to the fixing part 352 of the explosion-proof valve 350, thereby limiting the explosion-proof valve 350 within the second recessed groove 314. Thus, the assembly of the pole post 320, end cap plate 310, and explosion-proof valve 350 can be completed in a single injection molding process, reducing assembly difficulty, saving assembly costs, and improving assembly efficiency.

[0130] Optionally, the outer surface of the explosion-proof valve 350 is provided with nanopores. Specifically, the outer surface of the fixing part 352 of the explosion-proof valve 350 is provided with nanopores. Through nano-injection molding process, an anchor structure can be formed between the fixing part 352 and the main body plate 331. The anchor structure can improve the connection strength and sealing performance between the fixing part 352 and the main body plate 331.

[0131] Of course, in other embodiments, the explosion-proof valve 350 can also be connected to the bottom surface 314a of the second sinking trough 314 by laser welding.

[0132] like Figure 3 and Figure 9As shown, the end cover plate 310 is a rectangular plate, and there is a mounting hole 311 at both ends of the end cover plate 310 along its length. The two mounting holes 311 are the first mounting hole 311-1 and the second mounting hole 311-2, respectively. The first pole post 320-1 is located in the first mounting hole 311-1, and the second pole post 320-2 is located in the second mounting hole 311-2.

[0133] The main body plate 331 of the first insulating member 330-1 and the main body plate 331 of the second insulating member 330-2 are laid flat on the second surface 310b and extend from both ends of the end cover plate 310 along a direction close to each other.

[0134] In this embodiment, the two main plates 331 of the two insulating members 330 are laid flat on the second surface 310b of the end cover plate 310, and extend from both ends of the end cover plate 310 along a direction close to each other. Thus, the two insulating members 330, formed by nano-injection molding, can be attached to the second surface 310b of the end cover plate 310, thereby improving the strength of the end cover plate 310. By attaching the two insulating members 330 to the second surface 310b of the end cover plate 310, the thickness of the end cover plate 310 can be reduced, thereby reducing the space ratio of the end cover assembly 300.

[0135] like Figure 9 and Figure 10 As shown, the vent 315 is disposed between the first mounting hole 311-1 and the second mounting hole 311-2 of the end cover plate 310. Further, the vent 315 is located at the midpoint between the first mounting hole 311-1 and the second mounting hole 311-2.

[0136] The end cover plate 310 also includes a boss 316 protruding from the second surface 310b. The end cover plate 310 also has an injection hole 317 that penetrates the first surface 310a and the side surface of the boss 316 facing away from the second surface 310b. The injection hole 317 is located between the vent hole 315 and the second mounting hole 311-2.

[0137] The main body plate 331 of the first insulating member 330-1 includes a rectangular plate 331c and a protrusion 331d. The rectangular plate 331c extends from one end of the end cover plate 310 along its length to a position between the vent hole 315 and the injection hole 317 of the end cover plate 310. The rectangular plate 331c has a first through hole 331b corresponding to the position of the vent hole 315. The protrusion 331d protrudes from the side of the rectangular plate 331c facing the main body plate 331 of the second insulating member 330-2. The protrusion 331d has a second through hole 331f through which the boss 316 passes. The other main body plate 331 has a groove 331e that matches the shape of the protrusion 331d. The protrusion 331d extends into the groove 331e.

[0138] Understandably, electrolyte can be injected into the housing 100 through the injection port 317.

[0139] In this embodiment, the end cover plate 310 further includes a boss 316 protruding from the second surface 310b, and the protrusion 331d of the first insulating member 330-1 has a second through hole 331f through which the boss 316 passes. The boss 316 and the protrusion 331d can jointly improve the structural strength around the injection hole 317 of the end cover plate 310, and prevent the part around the injection hole 317 from deforming and expanding during the injection process, thereby pulling the explosion-proof valve 350 and affecting the stability of the explosion-proof valve 350.

[0140] like Figure 9 and Figure 10 As shown, the outer edge of the protrusion 331d of the first insulating member 330-1 and the rectangular plate 331c form a first side edge 331g facing the outer edge of the main body plate 331 of the second insulating member 330-2. The inner edge of the groove 331e and the main body plate 331 facing the outer edge of the rectangular plate 331c form a second side edge 331h. A gap G is formed between the first side edge 331g and the second side edge 331h.

[0141] In this embodiment, the first insulating member 330-1 and the second insulating member 330-2 are not in direct contact. Instead, a gap G is formed between the first side edge 331g and the second side edge 331h. This gap G can effectively prevent creepage between the first pole post 320-1 and the second pole post 320-2 through the first insulating member 330-1 and the second insulating member 330-2, thus avoiding insulation breakdown.

[0142] like Figure 9 As shown, the adapter piece 340 (second connector 340-2) corresponding to the second mounting hole 311-2 has a third side edge 340a facing another adapter piece 340 (first connector 340-1). The third side edge 340a is similar in shape to the second side edge 331h, and along the length direction of the end cover plate 310, the distance L3 of the second side edge 331h extending beyond the third side edge 340a is between 2mm and 10mm. For example, L3 is 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0143] In this embodiment, since the third side edge 340a and the second side edge 331h are similar in shape, and the distance L3 of the second side edge 331h extending beyond the third side edge 340a is between 2mm and 10mm, the insulation effect of the second insulating member 330-2 is improved, the risk of electrical connection between the second connector 340-2, the electrode tab of the electrode assembly 200 electrically connected to the second connector 340-2, and the end cover plate 310 is reduced, thus avoiding short circuit.

[0144] like Figure 11 and Figure 12 As shown, the outer surface of the electrode post 320 has nanopores; the post 321 includes a first post 321c near the adapter plate 340 and a second post 321d away from the adapter plate 340, with a flange 322 surrounding the outer peripheral surface of the second post 321d. An insulating member 330 surrounds the entire outer peripheral surface of the first post 321c, and the second post 321d is exposed on the outer peripheral surface of the flange 322. The first post 321c is made of a first material, and the second post 321d and the flange 322 are made of a second material, with the etching rate of the first material being lower than that of the second material.

[0145] Understandably, to reduce the cost of the electrode post, the negative electrode post in related technologies is usually made of copper-aluminum composite material, with the aluminum layer on top and the copper layer on the bottom. After stamping, a bowl-shaped copper layer surrounds the aluminum layer (e.g., ...). Figure 6 The pole (as shown). At this time, as... Figure 6 As shown, the surfaces of the electrode post that contact the insulating component are all made of copper, while the surfaces of the electrode post flange that contact the insulating component contain both copper and aluminum layers. Furthermore, the majority of the surface of the electrode post that contacts the insulating component is made of copper, with only a small portion being made of aluminum.

[0146] For copper and aluminum, two different materials, the etching rate of copper is lower than that of aluminum. Therefore, if the electrode is immersed in an acidic solvent, the degree of corrosion of the copper material layer is lower than that of the aluminum material layer under the same etching time. Consequently, the sealing and connection of the nanopores formed on the surface of the copper material layer combined with the insulating component will be inferior to those of the nanopores formed on the surface of the aluminum material layer combined with the insulating component.

[0147] In this embodiment, the first post 321c is made of a first material, and the second post 321d and flange 322 are made of a second material. The etching rate of the first material is less than that of the second material, which increases the surface area of ​​the insulating member 330 in contact with the second material, thereby improving the sealing and connection between the insulating member 330 and the post 320.

[0148] In one embodiment, the first material is copper and the second material is aluminum, but this is not a limitation.

[0149] It is understandable that the formation Figure 12 The pole shown can be formed by stamping. Figure 6 The pole structure shown is then milled into shape. Figure 12 The pole structure shown. Of course. Figure 12 The pole structure shown can be directly formed by cold heading.

[0150] like Figure 13 and Figure 14 As shown, the adapter piece 340 has a through hole 341 corresponding to the position of the through hole 331a, and the column 321 passes through the through hole 341 and is welded to the adapter piece 340.

[0151] In this embodiment, since the column 321 passes through the through hole 341 and is welded to the adapter plate 340, the end of the column 321 away from the flange 322 also extends out of the insulating member 330 on the side surface facing away from the end cover plate 310. Thus, during nano-injection molding, the positioning core in the injection mold can position the two ends of the column 320 axially, improving the stability of the column 320 assembly. Furthermore, the adapter plate 340 and the column 320 are welded together, which improves the flow capacity of the weld seam of the adapter plate 340.

[0152] As an example, the column 321 of the pole post 320 can be a square column with rounded chamfers or an elliptical column. When the column 321 is a square column with rounded chamfers, the torsional strength of the pole post 320 can be improved, and the material utilization rate of the pole post 320 can be increased. When the column 321 is an elliptical column, the major axis of the ellipse can be parallel to the length direction of the end cover plate 310 or parallel to the width direction of the end cover plate 310.

[0153] This application also provides an electrical device including an energy storage device 1 according to any of the above embodiments, wherein the energy storage device 1 supplies power to the electrical device. Since it includes the energy storage device 1 according to any of the above embodiments, the electrical device of this application has all the advantages and beneficial effects of any of the above embodiments, which will not be repeated here.

[0154] The electrical equipment can be energy storage devices, vehicles, energy storage containers, etc. For electrical equipment including the aforementioned energy storage device 1, the stability of the electrical equipment's operation can be improved, the probability of the electrical equipment downtime can be reduced, and the safety of the electrical equipment's use can be improved.

[0155] It is understood that the various embodiments / implementations provided in this application can be combined with each other without creating contradictions, and will not be described one by one here.

[0156] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0157] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0158] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the claims. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0159] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. An end cap assembly, characterized in that, include: An end cover plate includes a first surface and a second surface disposed opposite to the first surface along the thickness direction of the end cover plate. The end cover plate also has a mounting hole penetrating the first surface and the second surface. The end cover plate also has a second recessed groove formed by the second surface recessing towards the first surface. The end cover plate also has a vent hole penetrating the bottom surface of the second recessed groove and the first surface. An insulating component is an integrally injection molded part, comprising an integrally connected main body plate and an insulating protruding ring. The main body plate is attached to the second surface of the end cover plate, and the main body plate is provided with a through hole corresponding to the position of the mounting hole. The insulating protruding ring is connected to the side surface of the main body plate facing the end cover plate and surrounds the through hole. The adapter piece is attached to the side surface of the main body plate opposite to the end cover plate and covers the through hole; An electrode post includes a post body and a flange; the post body passes through the mounting hole and the through hole, and has a first end and a second end arranged along the thickness direction of the end cover plate, the first end extending out of the first surface, the flange surrounding and connecting to the outer peripheral surface of the first end, the second end being connected to the adapter piece, the main body plate and the end cover plate being sandwiched between the flange and the adapter piece; an insulating convex ring passes through the mounting hole and surrounds the outer peripheral surface of the post body and the outer peripheral surface of the flange; An explosion-proof valve is housed in the second sinking trough and the vent hole is sealed. The main body plate has a first through hole corresponding to the position of the vent hole. The explosion-proof valve includes a rupture part and a fixing part. The rupture part is exposed through the first through hole on the side surface of the main body plate facing away from the end cover plate. The fixing part surrounds the rupture part and is sandwiched between the bottom surface of the second sinking trough and the main body plate.

2. The end cap assembly according to claim 1, characterized in that, Both the outer surface of the end cap plate and the outer surface of the pole post have nanopores.

3. The end cap assembly according to claim 2, characterized in that, The column includes a first column near the adapter piece and a second column away from the adapter piece, and the flange is connected to the outer peripheral surface of the second column. The insulating element surrounds and wraps around the entire outer peripheral surface of the first post, and the second post is exposed on the outer peripheral surface of the flange and the outer peripheral surface of the flange; The first pillar is made of a first material, and the second pillar and the flange are made of a second material, wherein the etching rate of the first material is less than the etching rate of the second material.

4. The end cap assembly according to claim 3, characterized in that, The first material is copper, and the second material is aluminum.

5. The end cap assembly according to claim 1, characterized in that, The number of the pole, the adapter plate, and the insulating component are all two; The end cover plate is rectangular and has a mounting hole at both ends along its length. The two pole posts are respectively located in the two mounting holes. The two main plates of the two insulating elements are laid flat on the second surface and extend from both ends of the end cap plate in a direction close to each other along the length of the end cap plate.

6. The end cap assembly according to claim 1, characterized in that, The end cap plate also includes a boss protruding from the second surface, and the end cap plate also has an injection hole penetrating the first surface and the side surface of the boss facing away from the second surface. The main plate has a second through hole through which the boss passes.

7. The end cap assembly according to claim 1, characterized in that, The end cap plate also has a first recessed groove formed by a recess in the direction from the first surface to the second surface, and the mounting hole penetrates the bottom surface of the first recessed groove. In the thickness direction, a portion of the flange is accommodated within the first recessed groove, and a portion of the flange extends out of the first surface.

8. The end cap assembly according to claim 7, characterized in that, A first chamfer is provided at the connection between the bottom surface of the first groove and the inner wall surface of the mounting hole, and the first chamfer is between C0.1 and C0.

5.

9. The end cap assembly according to claim 7, characterized in that, The first sinking trough also has a side surface, which is connected to the bottom surface of the first trough and extends obliquely from the bottom surface of the first trough in a direction away from the axis of the column to the first surface.

10. The end cap assembly according to claim 1, characterized in that, The inner wall of the mounting hole is provided with a second chamfer at the connection between the inner wall and the second surface, and the second chamfer is between C0.1 and C0.

5.

11. An energy storage device, characterized in that, include: The housing includes a receiving cavity with an opening; The electrode assembly is housed within the receiving cavity; as well as The end cap assembly according to any one of claims 1 to 10, wherein the end cap assembly closes the opening of the receiving cavity.

12. An electrical appliance, characterized in that, The device includes the energy storage device of claim 11, wherein the energy storage device supplies power to the electrical equipment.

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